diff --git a/src/Serilog.Sinks.Console/Serilog.Sinks.Console.csproj b/src/Serilog.Sinks.Console/Serilog.Sinks.Console.csproj
index 8752163..31839fb 100644
--- a/src/Serilog.Sinks.Console/Serilog.Sinks.Console.csproj
+++ b/src/Serilog.Sinks.Console/Serilog.Sinks.Console.csproj
@@ -38,6 +38,7 @@
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
     <Reference Include="System" />
+    <Reference Include="System.Core" />
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>